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Generation of Random Variates

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Generation of Random Variates

by

James Huntley (view profile)

 

generates random variates from over 870 univariate distributions

logbeta_pdf(x, alpha, bet, c, d)
% logbeta_pdf.m - evaluates a Log Beta Probability Density.
%   See "Dataplot Reference Manual", LBEPDF, Vol.1, Aux. Chapter, NIST.
%   Note Error in text:  PDF needs a factor of dz/dx.
%
%  Created by Jim Huntley,  12/22/08
%

function [pdf] = logbeta_pdf(x, alpha, bet, c, d)

z = (log(x)-log(c)) ./ (log(d)-log(c));
pdf = z.^(alpha-1) .* (1-z).^(bet-1) ./ beta(alpha,bet) ./ x ./ (log(d)-log(c));

return

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